How do I post equations?

I have no idea where I'm supposed to put this post, so I'll try here. Is there any way I can get equations written in Microsoft Word to show up in my posts here? Writing an equation directly in the post, like x=d*y^(1/2) for example, doesn't look very good and can be somewhat difficult to decipher sometimes.

You can attach the word document to your post, but others will not be able to view it until a moderator approves it.

A better solution would be to learn the LaTeX commands, which is quite simple one you learn the symbols, and post fancy stuff like [tex]\frac{\partial^2 \psi_i}{\partial t^2}[/tex]. :) With it you can directly post readable equations immediately.